Improvement in machines for tapping mains



I. HANCOCK. y MACHINES FoR'TAPP'ING MAINS. No. 169,438. patented Nov. 2,1875.v

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UNITED STATES PATENT OFFICE.

JOHN HANCOCK, OF DANVILLE, PENNSYLVANIA.

IMPROVEMENT IN MACHINES FOR TAPPING MAINS.

Specification forming part of Letters Patent No. l 69,438, dated November 2, 1875; application filed June 17, 1875.

To all whom t may concern:

Be it known that I, JOHN HANCOCK, of Danville, in the county of Montour and State of Pennsylvania, have invented new and useful Improvements in a Machine for Tapping Gas and Water Mains against pressure to in sert a gate, cock, or plug without changing the position of the machine; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this speciiicatiou.

In the accompanying drawings, Figure l represents, a sectional view of the machine. Fig. 2 shows a plan view of the ratchet.

ln Fig` l, A represents a movable concaved base, which can be-changed to suit diiferent sized pipes. B is a shell or case with a revolving lid, C, secured by post M, washer O, and nut N, in which are four tools-namely, drill and tap, (not shown in drawing,) screwsocket wrench Q, and a device, P, for inserting a gate or stop. D is an arm, secured to case B by the key J, through which passes the hollow mandrel K, and through this mandrel passes the square feed-bar G, which, with ratchet E, nut L, swivel R, and hand-wheel F, composee the drill motion. S is a square socket, by which the feed-bar G may be connested with drill tap or screw-socket wrench Q. Q is a screw-socket wrench in the revolving lid O, through which passes bolt d to plate c, which, when screwed down, forms a friction or lock to reducer g or cook f, so that when bolt d is loosened the wrench may be readily removed from reducer g or cock f. P is a bar and forms part of a device, consisting of it and the shell a, the opening c in which to insert a gate, and the pin and slot b, with Which device a gate can be inserted into the hole bored in the main, if a cock is not wanted.

Fig. 2 represents the ratchet E with `the lock H, operated by the thumb-screw I to lock the ratchet-wheel, so as to produce a reverse motion for removing tap and wrench.

The operation of this machine is as follows: The base A being placed upon the pipe to be tapped, the machine is secured to the pipe by means of clamp-chains provided with suitable set-screws. The drill is then connected tothe feed-bar G by the socket S, which is turned by hollow mandrel K and ratchet E, and fed by swivel L and wheel F. The drill being removed the lid C is revolved, so that the tap may be connected to the feed-bar G, and the hole is tapped by the motion of ratchet and feed wheel F; the ratchet-wheel is then locked by lock H and thumb-screw I, and tap removed by a reverse motion of ratchet. The screwsocket wrench Q having been previously supplied with a cock and reducer locked by bolt d and friction-plate c, the lid is revolved, so as to connect the wrench'` with feed-bar G, and the cock is screwed into the pipe by the ratchet motion. The socket S being raised, the bolt d reversed releases the reducer g with cock f, and the wrench is then removed.

When a pipe is to be put into the main without a cock, the opening c, having been supplied with a gate, before the machineis clamped to the pipe, the lid O is revolved to bring the device P under the feed-bar G, and the gate is forced the 'required distance in the hole in pipe by J[he feed-wheel F.

What I claim as new, and wish to secure by Letters Patent, is-

l. The hollow mandrel K and square feedbar G, in combination with the nut L, swivel R, and ratchet E.

2. The lock H, Fig. 2, and thumb-screw I, in. combination with the ratchet wheel and .pawls, with which the ratchet is locked to form a backward motion, as and for the purpose above described.

3. The friction-plate c, operated by the bolt d in the screw-socket wrench Q, for fastening or loosening reducer g or cock f, in combination with the square feed-bar G, nut L, swivel R, and ratchet E.

4. The device consisting of the bar P, shell a, opening c for gate, pin and slot b, in combination with the square feed-bar G and feedwheel F for inserting gates into mains.

JOHN HANCOCK.

Witnesses:

P, G. MURRAY, B. F. FOULK. 

